#1
Which type of genetic material do most viruses have?
Both DNA and RNA
ExplanationMost viruses have either DNA or RNA as their genetic material, allowing for diverse genomic structures.
#2
Which cellular organelle is often exploited by viruses for the synthesis of viral proteins?
Endoplasmic reticulum
ExplanationThe endoplasmic reticulum is commonly utilized by viruses for the synthesis of their proteins during infection.
#3
Which class of viruses is characterized by a retroviral life cycle?
Retroviruses
ExplanationRetroviruses exhibit a unique life cycle involving the conversion of viral RNA into DNA using reverse transcriptase.
#4
What is the role of neuraminidase in the life cycle of influenza viruses?
Promotes the release of new virus particles from infected cells
ExplanationNeuraminidase facilitates the release of newly formed influenza virus particles from infected host cells.
#5
Which of the following is a common method used by viruses to enter host cells?
Endocytosis
ExplanationEndocytosis is a common mechanism used by viruses to enter host cells, involving the uptake of viral particles into the cell.
#6
In viral replication, what is the role of the enzyme reverse transcriptase?
Synthesizing DNA from RNA
ExplanationReverse transcriptase is responsible for converting viral RNA into DNA during the replication process.
#7
Which step is NOT a part of the viral replication cycle?
Translation
ExplanationTranslation, the synthesis of proteins from RNA, is not a direct step in the viral replication cycle.
#8
What is the primary mode of transmission for the influenza virus?
Airborne transmission
ExplanationInfluenza primarily spreads through airborne transmission, facilitated by respiratory droplets.
#9
Which type of viral genome is directly translated into functional proteins without the need for transcription?
Positive-sense RNA
ExplanationPositive-sense RNA viruses can be directly translated into functional proteins without the need for transcription.
#10
What is the primary target of HIV (Human Immunodeficiency Virus) in the human body?
T cells of the immune system
ExplanationHIV primarily targets and infects T cells, compromising the immune system.
#11
What is a viral vector in the context of gene therapy?
A modified virus used to deliver genetic material into cells
ExplanationViral vectors are altered viruses utilized to transport therapeutic genetic material into target cells for gene therapy.
#12
How do enveloped viruses differ from non-enveloped viruses?
Enveloped viruses have an additional lipid membrane
ExplanationEnveloped viruses possess an extra lipid membrane surrounding their capsid, distinguishing them from non-enveloped viruses.
#13
What is a zoonotic virus?
A virus that infects animals and can be transmitted to humans
ExplanationZoonotic viruses infect animals and can be transmitted to humans, posing potential public health threats.
#14
In the context of viral infections, what does the term 'cytopathic effect' refer to?
The death of infected cells
ExplanationCytopathic effect refers to the observable damage or death of host cells resulting from a viral infection.
#15
What is the significance of the lytic cycle in bacteriophages?
Release of newly formed virus particles by host cell lysis
ExplanationThe lytic cycle in bacteriophages involves the release of newly formed virus particles by causing the lysis or rupture of the host cell.